Second of all...The vowels i and U are sometimes dropped when placed between voiceless consonants (k, s, t, p and H) or at the end, you can skip it, but the best is to say the vowels like an whisper, for example desu
"dessssssssssssssssssssssssssssssssssssss su" put an long S, and finish it with a veeeeery low, almost silently U "^^

Aaah, It's sooo clean now!
Can I call you my Onee-chan, then? Since you're 1 year older than me!
I started some japanese lessons some time ago, at the beggining I didn't understand so much, but with your explanations, everything is more clear, Thanks a lot!!!!

AHahah, you are so cute
Did you know that? In Japan, if you call someone that you do not know as "Onee-chan" she will scold you XP
That's veeery non-polite u.u~
But since you're my cute student, I do not care , you can call me anything that you want XD

Gochisousama and Gochisousamadeshita are the same X_X
The difference is that with deshita, the expression goes to the past form "^^~
I didnt put the "past-verb" lesson, so i'm trying to avoid using these expressions that may cause confusion on the other students "^^

When you say "okaeri" to someone who is just entering in your house, you're saying : "welcome back home" or "welcome again", to ask for more food, they use Okawari, not okaeri "^^